What is a safe place/way for me to come up with a strong master password? I read another Super User post that mentioned GRC, but I'm not sure if that's safe/legitimate. What's the best place for me to go to create a random, long, good password? I really doubt just typing at random is a good choice, since there are biases for where fingers go.

GRC is definitely legitimate. I don't think you could be any more legitimate. As far as passwords for wireless networks go (and other passwords in general where I can just pick the amount of characters I need from a very long string), I find GRC to be the most useful place to generate these pseudo-random passwords. Otherwise, a good head -c 8 /dev/urandom on a linux box doesn't hurt either.

I've been using Roboform for a long time now, and one of the things it does is create random passwords. It has a free and paid version, and I'm not sure off the top of my head if that feature is present on both.

It’s an online password generator and password checker. The site offers a free windows application for password management as well.

Random Password Generator is the excellent and easy-to-use tool for getting new secure passwords. It allows you create secure passwords in one click of a button. Create single or multiple passwords of required length. The Password Generator provides set of options that allows your choose the required complexity of the password.